Episode Details

Bison once roamed freely across North America with little genetic variation—until humans nearly wiped them out. New DNA research reveals they were genetically connected 20,000 years ago, and modern herds have far less cattle ancestry than previously thought. With tens of millions dwindling to just a few hundred, their comeback is a triumph of conservation—but scientists warn that how we manage them now, using this deep genetic history, will determine if they truly thrive again as ecosystem keystone species.

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